Changes to Subscribe events

added the non-success response with the status 400

added the non-success response with the status 408

added the non-success response with the status 500

added the non-success response with the status 503

removed the non-success response with the status 1001

removed the non-success response with the status 1003

removed the non-success response with the status 1011

removed the non-success response with the status 1013

endpoint added